I edited my preferences to show the title before the artist and now my playlist just shows the titles and no artist and for 2 out of the 800 songs I have it still displays the artist first (first 2 tracks on the playlist)

WHY DOES IT LAG 3 SECONDS TO SWITCH TRACKS?

when I hit play when on shuffle it only plays a random track 50% of the time. the other 50% it plays the first.